package com.example.first;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;


public class DBHelper extends SQLiteOpenHelper {
    public static final String TB_NAME = "tb_rates";
    private static final  int VERSION = 1;
    private static final String DB_NAME = "myrate.db";

    public  DBHelper(Context context){
        super(context, DB_NAME, null, VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
         //初始化create table
        String sql = "CREATE TABLE"+TB_NAME+"(ID INTEGER PRIMARY KEY AUTOINCREMENT,CURNAME TEXT,CURRATE TEXT)";
        db.execSQL(sql);

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}
